Play a recording through my iphone?


Nov 18, 2013
When I have to do a lot of calling for work, via my iphone,
and I've reached (the prospective client who opted-in for information) voicemail,
if I have to repeat why I'm calling, it would helpful to instead play a recording
of what I have to say, because after several calls, I start to not sound as professional.

So, a recording of me would help my job, rather than me saying the same thing over and over again.
I know that there are external microphones available for iphones, so I thought their may be a solution for my situation.
Any ideas how I could play a recording through my iphone, when needed?